ActivityDesignerPaint.DrawRoundedRectangle Method
Draws a rounded rectangle on the activity designer surface.
Assembly: System.Workflow.ComponentModel (in System.Workflow.ComponentModel.dll)
public static void DrawRoundedRectangle( Graphics graphics, Pen drawingPen, Rectangle rectangle, int radius )
Parameters
- graphics
- Type: System.Drawing.Graphics
The Graphics on which to draw the rectangle.
- drawingPen
- Type: System.Drawing.Pen
The Pen to draw the rectangle.
- rectangle
- Type: System.Drawing.Rectangle
The Rectangle that defines the bounds of the rounded rectangle.
- radius
- Type: System.Int32
The integer value of the radius to use for the rounded edges.
| Exception | Condition |
|---|---|
| ArgumentNullException | graphics or drawingPen contains a null reference (Nothing in Visual Basic). |
DrawRoundedRectangle uses the GetRoundedRectanglePath method to obtain the path to draw.
The following example demonstrates a way to use the ActivityDesignerPaint class to draw a custom activity on the workflow design surface. A rounded rectangle is first drawn using the DrawRoundedRectangle method. Text is then drawn using DrawText and is placed at the location of the TextRectangle of the ActivityDesigner. Additionally, the Image associated with the ActivityDesigner is drawn using the DrawImage method of the ActivityDesignerPaint class. Finally, an expand button used by a CompositeActivity is drawn using the DrawExpandButton.
private bool expanded = true; private bool useBasePaint = false; public bool UseBasePaint { get { return this.useBasePaint; } set { this.useBasePaint = value; } } public bool Expanded { get { return this.expanded; } set { this.expanded = value; } } protected override void OnPaint(ActivityDesignerPaintEventArgs e) { if (this.UseBasePaint == true) { base.OnPaint(e); return; } DrawCustomActivity(e); } private void DrawCustomActivity(ActivityDesignerPaintEventArgs e) { Graphics graphics = e.Graphics; CompositeDesignerTheme compositeDesignerTheme = (CompositeDesignerTheme)e.DesignerTheme; ActivityDesignerPaint.DrawRoundedRectangle(graphics, compositeDesignerTheme.BorderPen, this.Bounds, compositeDesignerTheme.BorderWidth); string text = this.Text; Rectangle textRectangle = this.TextRectangle; if (!String.IsNullOrEmpty(text) && !textRectangle.IsEmpty) { ActivityDesignerPaint.DrawText(graphics, compositeDesignerTheme.Font, text, textRectangle, StringAlignment.Center, e.AmbientTheme.TextQuality, compositeDesignerTheme.ForegroundBrush); } System.Drawing.Image image = this.Image; Rectangle imageRectangle = this.ImageRectangle; if (image != null && !imageRectangle.IsEmpty) { ActivityDesignerPaint.DrawImage(graphics, image, imageRectangle, DesignerContentAlignment.Fill); } ActivityDesignerPaint.DrawExpandButton(graphics, new Rectangle(this.Location.X, this.Location.Y, 10, 10), this.Expanded, compositeDesignerTheme); }
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
